JP5310198B2 - Steel pipe joint structure - Google Patents

Description

  The present invention relates to a mechanical joint structure in which steel pipes used for piles and the like are connected in series.

  Generally, a steel pipe pile is manufactured by connecting a plurality of steel pipes in series in a longitudinal direction at a construction site such as a construction site. In this case, welding is used to connect the steel pipes. However, welding of steel pipes at construction sites is difficult at work sites where the use of fire is restricted, and there are large parts that are affected by the technical conditions of engineers such as weather conditions and welders. There is a problem that it takes a lot of labor and time for work and inspection of the welded part after welding.

  Therefore, in recent years, a method of connecting a plurality of steel pipes using a mechanical joint without performing a welding operation has been implemented. For example, Patent Document 1 describes a joint structure of steel pipes that mechanically connect steel pipes using joint steel pipes, arc-shaped joints, bolts, and the like that are previously attached to the ends of the steel pipes. Non-Patent Document 1 discloses a triple plate joint using an end plate, a connection plate, and a connection bolt. Further, Non-Patent Document 2 discloses a pairing joint (non-welded joint) using a hydraulic jack, an inner ring, and an outer ring.

JP 2006-291543 A

Triple plate joint (Nippon Hume Co., Ltd. catalog) Pairing joint (Japan Pile Corporation catalog)

  When connecting a steel pipe using the joint structure of the steel pipe described in the said patent document 1, the hole for bolts is provided in the joint attached to the steel pipe, and the bolt is attached. Moreover, when connecting a steel pipe using the triple plate joint described in the said nonpatent literature 1, the plate for a connection is made in the end plate of the steel pipe end part, and is attached with the volt | bolt. However, in these joint structures, it takes time to align the bolt and the bolt hole. In addition, there is a concern that the strength of the steel pipe and the steel pipe connection portion may be reduced due to drilling holes in the steel pipe connection portion, and the strength of the steel pipe after connection may be reduced due to stress concentration on the bolt portion. is there.

  When connecting a steel pipe using the pairing joint described in Non-Patent Document 2, the wedge is pushed in using a hydraulic jack and the inner ring and the outer ring are fixed. There is a problem that construction takes time.

  In addition, when steel pipes are connected in series at construction sites, etc., the steel pipes after connection are more than a certain amount so as not to cause a decrease in the strength of the steel pipe due to the occurrence of so-called `` square bends '' that are bent at the joints. It is necessary to maintain the linearity. Therefore, in the joint structure of steel pipes described in Patent Document 1, Non-Patent Document 1 and Non-Patent Document 2, when connecting, the accuracy of manufacturing and mounting accuracy of the connecting end plate (projecting portion) at the end of the steel pipe is high. Was requested. However, increasing the manufacturing accuracy and mounting accuracy of the connection end plate hinders the efficiency of manufacturing and causes a problem of increasing costs.

  Therefore, in view of the above problems, the object of the present invention is to provide a mechanical joint that is efficient in manufacturing and transportation, does not use screws, bolts, etc. It is an object of the present invention to provide a steel pipe joint structure that can be carried out efficiently and quickly.

According to this invention, it is a joint structure which connects two steel pipes in series, Comprising: A pair of protrusion part which protrudes outside the outer peripheral surface of a steel pipe provided in the edge part of two steel pipes, and two In a state where the ends of the steel pipes are butted together, a plurality of connecting members attached from the outside of the pair of protrusions and having grooves formed on the inner peripheral surface for receiving the pair of protrusions, and the pair of protrusions A locking portion that is mounted on the outside of the plurality of connecting members, and that can be brought into contact with the upper surface of the connecting member that is mounted on the protruding portion at the upper end of the fixing member wherein the is provided, the joint structure of the steel pipe is provided.

  The protruding portion may be configured by a disk-shaped member, a ring-shaped member, or an arc-shaped member attached to an end portion of the steel pipe.

  The plurality of connection members may have an arc shape, and an annular shape surrounding the outer peripheral surface of the steel pipe may be configured by combining the connection members.

  A convex portion may be provided on one opposing surface of the pair of projecting portions, and a concave portion capable of receiving the convex portion may be provided on the other opposing surface.

The lower end of the fixing member is provided with a protrusion that is fastened to the lower surface of the connection member attached to the protrusion , and the connection member is provided with a slit that allows the protrusion to pass when the fixing member is attached. It may be configured to surround the outer peripheral surface of the steel pipe in a state where it is in a closed state .

The opposing surfaces of the pair of projecting portions may have shapes that match each other, one opposing surface may have a concave spherical shape, and the other opposing surface may have a convex spherical shape.

In addition, a cross-shaped groove having a slope that becomes deeper toward the center of the steel pipe is formed on the facing surface of one of the protruding portions, and a shape that fits the cross-shaped groove is formed on the facing surface of the other protruding portion. The cross-shaped convex part which has the gradient which becomes high toward the center of a steel pipe may be formed.

  Further, a cross-shaped groove having a slope that becomes shallower toward the center of the steel pipe is formed on the facing surface of one of the protruding portions, and a shape that fits the cross-shaped groove is formed on the facing surface of the other protruding portion. The cross-shaped convex part which has the gradient which becomes low toward the center of a steel pipe may be formed.

  ADVANTAGE OF THE INVENTION According to this invention, the structure of a steel pipe joint which can simplify a structure, can adjust linearity easily, and can aim at cost reduction without using a screw | bolt etc. is provided. ADVANTAGE OF THE INVENTION According to this invention, the connection operation of the steel pipe in a construction site can be implemented efficiently and rapidly at low cost.

It is the perspective view which looked at the joint structure 1 concerning the 1st Embodiment of this invention from diagonally upward. 1 is a longitudinal sectional view of a joint structure 1 in a central portion of a steel pipe 10. FIG. It is explanatory drawing which shows the state which faced | matched the lower end of the steel pipe 10 arrange | positioned above, and the upper end of the steel pipe 10 arrange | positioned below. It is explanatory drawing which shows the state which mounted | wore the connection member 15 from the outer side of the up-and-down protrusion part 11. FIG. FIG. 6 is an explanatory view showing a state in which a cylindrical fixing member 20 is mounted on the outside of the connection member 15. It is explanatory drawing which shows the example of the member previously provided in each upper and lower steel pipe 10 as the protrusion part 11. FIG. It is explanatory drawing which shows the example of the member previously provided in each upper and lower steel pipe 10 as the protrusion part 11. FIG. It is the perspective view which looked at the joint structure of mechanical joint 1 'of the steel pipe 10 concerning 2nd Embodiment from diagonally upward. 1 is a longitudinal sectional view of a joint structure 1 ′ in a central portion of a steel pipe 10. It is the perspective view which looked at the joint structure 1 '' of the steel pipe 10 concerning 3rd Embodiment from diagonally upward. It is AA sectional drawing of fixing member 20 'shown in FIG. It is BB sectional drawing of the connection member 15 'attached to the steel pipe 10 shown in FIG. FIG. 11 is a longitudinal sectional view of a joint structure 1 ″ at a central portion of the steel pipe 10 shown in FIG. 10. It is explanatory drawing of the joint structure 50 concerning 4th Embodiment. It is explanatory drawing of the joint structure 60 concerning 5th Embodiment. It is explanatory drawing of the joint structure 70 concerning 6th Embodiment. It is explanatory drawing of the joint structure 80 concerning 7th Embodiment. It is explanatory drawing of the joint structure 90 concerning 8th Embodiment. It is explanatory drawing of the joint structure 100 concerning 9th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a perspective view of a joint structure 1 according to a first embodiment of the present invention viewed obliquely from above. By this joint structure 1, the ends of two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below) are connected. 1 shows a state in which the joint structure 1 is disassembled. FIG. 2 is a longitudinal sectional view of the joint structure 1 in the central portion of the steel pipe 10. 3-5 is explanatory drawing of the process of connecting the two steel pipes 10 by the joint structure 1, and FIG. 3 matched the upper end of the steel pipe 10 arrange | positioned below with the lower end of the steel pipe 10 arrange | positioned up. FIG. 4 shows a state where the connection member 15 is mounted from the outside of the upper and lower protrusions 11, and FIG. 5 shows a state where the cylindrical fixing member 20 is mounted on the outside of the connection member 15. .

  The lower end of the steel pipe 10 disposed on the upper side and the upper end of the steel pipe 10 disposed on the lower side are provided with a pair of projecting portions 11 projecting outward from the outer peripheral surface of each steel pipe 10. In this embodiment, the ring-shaped member 12 whose outer diameter is larger than the outer diameter of the steel pipe 10 and whose inner diameter is smaller than the inner diameter of the steel pipe 10 is the lower end of the steel pipe 10 disposed above and the steel pipe 10 disposed below. These ring-shaped members 12 are attached to the upper end of each of them, and the outer portions of the ring-shaped members 12 serve as projecting portions 11 that project outward from the outer peripheral surfaces of the upper and lower steel pipes 10.

  Four connection members 15 are arranged around the protrusions 11. Each connection member 15 has an arc shape, and by combining these connection members 15, an annular shape surrounding the outer peripheral surface of the steel pipe 10 can be formed. Grooves 16 for integrally receiving the pair of protrusions 11 are provided on the inner peripheral surface of each connection member 15 in a state where the pair of upper and lower protrusions 11 are overlapped. When each connecting member 15 is combined to form an annular shape surrounding the outer peripheral surface of the steel pipe 10, each groove 16 provided on the inner peripheral surface of each connecting member 15 forms one annular groove. It becomes.

  A cylindrical fixing member 20 is attached to the steel pipe 10 disposed above so as to be movable up and down. The inner diameter of the fixing member 20 has such a size that the fixing member 20 can be mounted on the outer side of the annular shape configured by combining the connecting members 15 described above. An annular shape can be held inside the fixing member 20.

  A locking portion 21 that protrudes inward from the inner surface of the fixing member 20 is provided at the upper end of the fixing member 20. The distal end of the locking portion 21 protrudes inward to a position where it can abut on an annular upper surface constituted by combining the connecting members 15 described above.

In the joint structure 1 of the steel pipe 10 according to the first embodiment of the present invention constituted by the components described above, first, as shown in FIG. Match. Then, the protrusion part 11 (ring-shaped member 12) provided in the edge part of the upper and lower steel pipe 10 will be integrated.

Next, as shown in FIG. 4, the groove 16 provided in the four arcuate connection members 15 arranged around the protrusion 11 protrudes so as to receive the integrated protrusion 11. The connecting member 15 is placed on the part 11. Then, the integrated projecting portion 11 is received in the groove 16, so that the steel pipe 10 is joined in the longitudinal direction.

Next, as shown in FIG. 5, the cylindrical fixing member 20 attached to the upper steel pipe 10 so as to be movable up and down is covered from the outside so as to cover the connection member 15 after the projecting portion 11 is integrated. Installing. Then, the connecting member 15 is fixed to the steel pipe 10 by the fixing member 20. At this time, since the fixing member 20 is provided with a locking portion 21 protruding inward from the inner surface of the fixing member 20 at the upper end, the locking portion 21 abuts on the upper end of the connection member 15, Does not fall from the connecting member 15.

As a result of the above-described operation, the connecting member 15 and the fixing member 20 constitute a joint structure 1 that can efficiently connect the upper and lower steel pipes 10 with a simple configuration without using welding or screws. .
Further, since the steel pipes 10 are connected to each other by the connecting member 15 in a state where the ring-shaped member 12 is attached to the longitudinal end portion of the steel pipe 10, the end portions of the steel pipe 10 are prevented from being crushed and compressed in the longitudinal direction of the steel pipe. Power can be transmitted efficiently.
On the other hand, since the upper and lower steel pipes 10 are integrated with the ring-shaped member 12 by the connecting member 15 and the connecting member 15 is fixed to the steel pipe 10 by the fixing member 20, a tensile load is applied in the longitudinal direction of the steel pipe. However, the tensile load is transmitted to each steel pipe 10.

That is, when the work is actually performed using the steel pipe 10 at the construction site, when the upper and lower steel pipes 10 are connected using the joint structure 1 of the steel pipe 10 according to the present embodiment, the compressive force applied in the longitudinal direction of the steel pipe and The steel pipe 10 is connected so as to sufficiently transmit the tensile load, and the connected steel pipe 10 can be used as a pile or the like. At that time, since the compressive force and the tensile load applied in the longitudinal direction of the steel pipe are sufficiently transmitted, the number of members of the steel pipe 10 to be used can be reduced. Furthermore, by using the joint structure 1 of the steel pipe 10 according to the present embodiment, it is possible to easily and quickly connect the steel pipes 10 with a low-cost and compact joint structure without requiring a special technique as compared with welding or the like. Can do.

In addition, in this Embodiment, although the member previously provided in each upper and lower steel pipe 10 as the protrusion part 11 was demonstrated as the ring-shaped member 12 which is a ring shape, this invention is not limited to this.
6 and 7 show examples of members provided on the upper and lower steel pipes 10 as the protrusions 11. For example, the member attached to each of the upper and lower steel pipes 10 as the protruding portion 11 may be a disk-like member 17 as shown in FIG. 6 or an arc-like member 18 as shown in FIG.
Further, in the present embodiment, it has been described that the shape of the connection member 15 is an arc shape, and the number thereof is four. However, the connection member 15 has the protrusions 11 at the ends of the upper and lower steel pipes 10. What is necessary is just to have the groove | channel 16 which makes it integrate, the shape is not restricted to circular arc shape, and the number is not limited to four.

(Second Embodiment)
FIG. 8 is a perspective view of the joint structure of the mechanical joint 1 ′ of the steel pipe 10 according to the second embodiment of the present invention as viewed obliquely from above. By this joint structure 1 ′, the ends of the two steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged on the upper side and the upper end of the steel pipe 10 arranged on the lower side) are connected. The state which decomposed | disassembled the joint structure 1 is shown. FIG. 9 is a longitudinal sectional view of the joint structure 1 ′ in the central portion of the steel pipe 10.
In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, and other parts and the like are the same, description thereof will be omitted.

  A concave ring-shaped member 25 having a concave portion 25 ′ is attached in advance to the upper steel pipe 10 of the two steel pipes 10 to be connected. A convex ring-shaped member 26 having a convex portion 26 ′ is attached in advance to the other lower steel pipe 10. Here, the concave portion 25 ′ has a size capable of inserting the convex portion 26 ′. In addition, the radial direction edge part of each ring-shaped member 25 and 26 has the protrusion part 11 which protrudes outside the outer peripheral surface of the steel pipe 10 similarly to the said 1st Embodiment.

  In the joint structure 1 ′ of the steel pipe 10 according to the second embodiment of the present invention configured by the components described above, it is attached in advance to the ends of the two steel pipes 10 to be connected. The end portions of the two steel pipes 10 are butted so that the concave ring-shaped member 25 and the convex ring-shaped member 26 overlap each other. At this time, the concave ring plate 25 and the convex ring member 26 are overlapped so that the convex portion 26 ′ is received in the concave portion 25 ′.

Thereafter, the protrusions 11 from the outer peripheral surfaces of the steel pipes 10 of the concave ring-shaped member 25 and the convex ring-shaped member 26 are fitted into the grooves 16 provided in the connecting member 15, and are provided in the upper and lower steel pipes 10. The protrusion 11 is integrated. Thereafter, the fixing member 20 is attached so as to cover the outer periphery of the connection member 15. At this time, since the fixing member 20 is provided with a locking portion 21 protruding inward from the inner surface of the fixing member 20 at the upper end, as in the first embodiment, the locking portion at the upper end of the fixing member 20 is provided. 21 does not contact the upper end of the connection member 15, and the fixing member 20 is not separated from the connection member 15. Further, since the concave portion 25 ′ and the convex portion 26 ′ are integrally overlapped and meshed with each other, when the upper steel pipe 10 is rotated, the lower steel pipe 10 is also rotated.

  A plurality of steel pipes 10 are connected using the steel pipe joint structure 1 'according to the second embodiment described above, and driven at the construction site while rotating the connected steel pipes 10 as piles or the like on the ground. There is a case to go. At this time, when one of the connected steel pipes 10 is rotated, the rotation is transmitted to the entire pile (all connected steel pipes 10), and the piles and the like can be driven into the ground efficiently. It becomes possible.

(Third embodiment)
FIG. 10 is a perspective view of the joint structure 1 ″ of the steel pipe 10 according to the third embodiment of the present invention as seen obliquely from above. By this joint structure 1 '', the ends of two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below) are connected. FIG. 10 shows a state where the joint structure 1 ″ is disassembled.

FIG. 11 is an AA cross-sectional view of the fixing member 20 ′ shown in FIG. Four protrusions 41 are provided at the lower end of the outer periphery of the fixing member 20 ′, and the intervals between the protrusions 41 are equal.
FIG. 12 is a cross-sectional view of the connecting member 15 ′ attached to the steel pipe 10 shown in FIG. As shown in FIG. 12, the four connecting members 15 ′ fix the ring-shaped member 12 with the slits 42 provided in the steel pipe 10. At this time, as shown in FIG. 11, the slits 42 are provided at four locations on the outer periphery of the steel pipe 10 so as to correspond to the protrusions 41 so that the gaps between the slits 42 are even.
FIG. 13 is a longitudinal sectional view of the joint structure 1 ″ in the central portion of the steel pipe 10.

  In the present embodiment, only the parts different from the first and second embodiments described above will be described, and common components and the like will be omitted. Here, the connection member 15 'and the fixing member 20' in the third embodiment will be described.

  Two steel pipes 10 are in a state of overlapping a ring-shaped member 12 attached in advance as a coupling member, and like the first and second embodiments, four arcuate connection members 15 ' The two ring-shaped members 12 are fixed. However, in the third embodiment, when the connecting member 15 ′ is attached to the steel pipe 10, as shown in FIG. 10, the size and shape are such that a slit 42 is provided between the connecting members 15 ′. It has become. In addition, a cylindrical fixing member 20 ′ is prepared in advance on the steel pipe 10 disposed above, and a protruding portion 41 protruding in the longitudinal direction of the steel pipe and in the radial center direction of the steel pipe is provided on the outer periphery of the fixing member 20 ′. Is provided. Here, the width of the slit 42 is wider than the width of the protrusion 41.

  In the joint structure of the steel pipe mechanical joint 1 ″ according to the third embodiment of the present invention configured as described above, the ring-shaped members 12 of the two steel pipes 10 are integrated by the four connection members 15 ′. Fixed. The fixing member 20 ′ covers the connecting member 15 ′, so that the connecting member 15 ′ is fixed to the steel pipe 10 and the steel pipes 10 are connected to each other. When the fixing member 20 ′ covers the connecting member 15 ′, the fixing member 20 ′ can be placed on the connecting member 15 ′ by passing the projection 41 provided on the fixing member 20 ′ through the slit 42. . Further, after the fixing member 20 ′ is placed on the connection member 15 ′, the fixing member 20 ′ is rotated to shift the position of the protrusion 41 from the position of the slit 42. Thereby, the protrusion 41 is fixed to the lower surface of the connection member 15 ′, and the connection member 15 ′ is fixed to the steel pipe 10.

  As a result, as shown in FIG. 13, the two steel pipes 10 having the ring-shaped plate 20 are connected via the connection member 15 ′ and the fixing member 20 ′, and further provided on the sheath-like fixing member 20 ′. When the connecting member 15 ′ is restrained from above and below by the locking portion 21 and the protruding portion 41, the connecting member 15 ′ is fixed to the connecting portion of the steel pipe 10 and is less likely to come off.

(Fourth embodiment)
FIG. 14 is an explanatory diagram of a joint structure 50 according to the fourth embodiment of the present invention. FIG. 14A is a perspective view of the joint structure 50 as viewed obliquely from above. The joint structure 50 connects the ends of the two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below). FIG. 14A shows a state where the joint structure 50 is disassembled. 14B is a horizontal cross-sectional view of the joint structure 50 when the steel pipe 10 is connected, and FIG. 14C is an enlarged cross-sectional view of the joint structure 50 when the steel pipe 10 is connected. That is, FIG. 14B shows the AA cross section in FIG. In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, description of other members and the like is omitted.

  The lower end of the steel pipe 10 disposed on the upper side and the upper end of the steel pipe 10 disposed on the lower side are provided with a pair of protruding portions 11 protruding outward from the outer peripheral surface of each steel pipe 10. In the fourth embodiment, a convex spherical disk 51 and a concave spherical disk 52 whose outer diameter is larger than the outer diameter of the steel pipe 10 and whose surfaces to be joined are spherical are attached to the ends of the steel pipe 10. A convex spherical disk 51 is attached to the lower end of the steel pipe 10 disposed above so as to be convex downward, and a concave spherical disk 52 is concave upward to the upper end of the steel pipe 10 disposed below. Attached to. Here, the convex spherical disk 51 and the concave spherical disk 52 are shaped so as to be suitable when they are overlapped and joined. That is, the curvatures of the surfaces to be joined of the convex spherical disk 51 and the concave spherical disk 52 are equal. Note that the outer portions of the convex spherical disk 51 and the concave spherical disk 52 are protruding portions 11 that protrude outward from the outer peripheral surfaces of the upper and lower steel pipes 10. The curvature of the convex spherical disk 51 and the concave spherical disk 52 may be appropriately determined according to the material, cross-sectional area, etc. of the steel pipe 10 constituting the joint structure 50.

  In the joint structure 50 according to the fourth embodiment of the present invention configured by the components described above, a convex spherical disk 51 attached in advance to the ends of the two steel pipes 10 to be connected; The end portions of the upper and lower steel pipes 10 (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below) are butted so that the concave spherical disks 52 overlap each other.

  Thereafter, the protrusions 11 from the outer peripheral surfaces of the steel pipes 10 of the convex spherical disk 51 and the concave spherical disk 52 are fitted into the grooves 16 provided in the connecting member 15, and the protrusions 11 provided on the upper and lower steel pipes 10 are fitted. Integrate. And the fixing member 20 is attached so that the outer periphery of the connection member 15 may be covered. At this time, since the fixing member 20 is provided with a locking portion 21 protruding inward from the inner surface of the fixing member 20 at the upper end, as in the first embodiment, the locking portion at the upper end of the fixing member 20 is provided. 21 does not contact the upper end of the connection member 15, and the fixing member 20 is not separated from the connection member 15.

  Further, in the joint structure 50 connected as described above, since the two steel pipes 10 are connected by overlapping the convex spherical disk 51 and the concave spherical disk 52, the joints of the steel pipe 10 after the connection are vertically moved. Even when the steel pipe is bent, the upper steel pipe 10 is moved so as to slide along the concave spherical disk 52 and can be easily corrected so as to maintain linearity. In the present embodiment, the convex spherical disk 51 is attached to the lower end of the steel pipe 10 disposed above so as to protrude downward, and the concave spherical disk 52 is attached to the upper end of the steel pipe 10 disposed below. However, the present invention is not limited to this, and a concave spherical disk 52 is attached to the lower end of the steel pipe 10 disposed above, and a convex spherical disk 51 is attached to the upper end of the steel pipe 10 disposed below. Also good. However, from the easiness of the straightening work when the upper and lower steel pipes are bent, the convex spherical disk 51 is attached to the lower end of the steel pipe 10 arranged so as to protrude downward, and the steel pipe arranged below. A concave spherical disk 52 is preferably attached to the upper end of 10.

(Fifth embodiment)
FIG. 15 is an explanatory diagram of a joint structure 60 according to the fifth embodiment of the present invention. FIG. 15A is a perspective view of the joint structure 60 as viewed obliquely from above. The joint structure 60 connects the ends of the two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below). FIG. 15A shows a state where the joint structure 60 is disassembled. 15B is a horizontal cross-sectional view of the joint structure 60 when the steel pipe 10 is connected, and FIG. 15C is an enlarged cross-sectional view of the joint structure 60 when the steel pipe 10 is connected. That is, FIG. 15B shows a BB cross section in FIG. 15C, and FIG. 15C shows a B′-B ′ cross section in FIG. In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, description of other members and the like is omitted.

In the fifth embodiment, a convex spherical ring 61 in which the outer diameter is larger than the outer diameter of the steel pipe 10, the inner diameter is smaller than the inner diameter of the steel pipe 10, and the surface (surface to be joined) to be abutted when the steel pipe is connected is a spherical shape. A concave spherical ring 62 is attached to the end of the steel pipe 10. A convex spherical ring 61 is attached to the lower end of the steel pipe 10 arranged above so as to be convex downward, and a concave spherical ring 62 is attached to the upper end of the steel pipe 10 arranged below so as to be concave upward. It is done. Here, the shape of the convex spherical ring 61 and the concave spherical ring 62 is a shape that fits when they are overlapped and joined. In addition, the outer part of the convex spherical ring 61 and the concave spherical ring 62 is a protruding portion 11 that protrudes outward from the outer peripheral surfaces of the upper and lower steel pipes 10. Further, the curvature of the convex spherical ring 61 and the concave spherical ring 62 may be appropriately determined depending on the material, cross-sectional area, etc. of the steel pipe 10 constituting the joint structure 60.

In the joint structure 60 according to the fifth embodiment of the present invention configured by the components described above, a convex spherical ring 61 attached in advance to the ends of the two steel pipes 10 to be connected; The ends of the upper and lower steel pipes 10 (the lower end of the steel pipe 10 disposed above and the upper end of the steel pipe 10 disposed below) are butted so that the concave spherical ring 62 overlaps. The subsequent connection process between the steel pipes 10 is the same as that in the fourth embodiment, and a description thereof will be omitted.

In the joint structure 60 connected as described above, since the two steel pipes 10 are connected by overlapping the convex spherical ring 61 and the concave spherical ring 62, the upper and lower steel pipes are connected at the joint portion of the steel pipe 10 after the connection. Even when the corner breakage occurs, the upper steel pipe 10 can be moved so as to slide along the concave spherical ring 62 and can be easily corrected so as to maintain linearity.

(Sixth embodiment)
FIG. 16 is an explanatory diagram of a joint structure 70 according to the sixth embodiment of the present invention. FIG. 16A is a perspective view of the joint structure 70 as viewed obliquely from above. The joint structure 70 connects the ends of the two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below). FIG. 16A shows a state where the joint structure 70 is disassembled. 16B is a horizontal cross-sectional view of the joint structure 70 when the steel pipe 10 is connected, and FIG. 16C is an enlarged cross-sectional view of the joint structure 70 when the steel pipe 10 is connected. That is, FIG. 16B shows a CC cross section in FIG. 16C, and FIG. 16C shows a C′-C ′ cross section in FIG. In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, description of other members and the like is omitted.

In the sixth embodiment, the outer diameter is larger than the outer diameter of the steel pipe 10, a cross-shaped cruciform protrusion 71 is formed, the disk 72 with a convex cruciform protrusion whose surface to be joined is a plane, and the cross-shaped cross A concave cross grooved disk 74 having a planar shape in which a groove 73 is formed is attached to the end of the steel pipe 10. A disc 72 with a convex cross projection is attached to the lower end of the steel pipe 10 arranged above, and a concave cross groove is attached to the upper end of the steel pipe 10 arranged below so that the cross projection 71 is convex downward. The attached disk 74 is attached so that the cross groove 73 is concave upward. Here, the shape of the disc 72 with a convex cross projection and the disc 74 with a concave cross groove is a shape that fits when they are overlapped and joined. Further, the outer portions of the convex cross projection-equipped disc 72 and the concave cross-grooved disc 74 are projections 11 that project outward from the outer peripheral surfaces of the upper and lower steel pipes 10. Here, the shape of the cross-shaped projection 71 and the cross-shaped groove 73 may be appropriately determined depending on the material, cross-sectional area, etc. of the steel pipe 10 constituting the joint structure 70. In the present embodiment, the shape of the cruciform protrusion 71 is a shape that forms a gradient that increases toward the center of the steel pipe 10, and the shape of the cross groove 73 is a shape that forms a gradient that deepens toward the center of the steel pipe 10. It is said.

In the joint structure 70 according to the sixth embodiment of the present invention constituted by the components described above, a disk with convex cross projections attached in advance to the ends of the two steel pipes 10 to be connected 72 and the concave cross grooved disk 74 are abutted so that the cruciform protrusion 71 and the cross groove 73 overlap. That is, as shown to Fig.16 (a), the edge part (The lower end of the steel pipe 10 arrange | positioned above and the upper end of the steel pipe 10 arrange | positioned below) of two upper and lower steel pipes 10 is faced | matched. At this time, the disc 72 with a convex cross projection and the disc 74 with a concave cross groove are overlapped so that the cross projection 71 is fitted in the cross groove 73. Since the subsequent connection process between the steel pipes 10 is the same as that of the fourth embodiment, description thereof is omitted.

In the joint structure 70 connected as described above, even when a displacement of the upper and lower steel pipes 10 occurs in the joint part of the steel pipe 10 after connection, the joint structure 70 is slid along the direction of the cruciform protrusion 71 and the cross groove 73. By moving the steel pipe 10 upward and downward, the steel pipes 10 are easily corrected to the correct positions. Further, since the steel pipes 10 are connected so that the cruciform protrusion 71 and the cross groove 73 overlap each other, the rotational force applied to one steel pipe 10 is efficiently transmitted to the other steel pipe 10. Therefore, as in the second embodiment, when driving a plurality of connected steel pipes 10 while rotating them on the ground, a pile or the like (connected steel pipes 10) can be driven efficiently.

(Seventh embodiment)
FIG. 17 is an explanatory diagram of a joint structure 80 according to the seventh embodiment of the present invention. FIG. 17A is a perspective view of the joint structure 80 as viewed obliquely from above. The joint structure 80 connects the ends of the two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below). FIG. 17A shows a state where the joint structure 80 is disassembled. FIG. 17B is a horizontal cross-sectional view of the joint structure 80 when the steel pipe 10 is connected, and FIG. 17C is an enlarged cross-sectional view of the joint structure 80 when the steel pipe 10 is connected. That is, FIG. 17B shows a DD cross section in FIG. 17C, and FIG. 17C shows a D′-D ′ cross section in FIG. In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, description of other members and the like is omitted.

In the seventh embodiment, a ring 81 with convex protrusions and a ring 82 with concave grooves whose outer diameter is larger than the outer diameter of the steel pipe 10 and whose inner diameter is smaller than the inner diameter of the steel pipe 10 and whose surfaces to be joined are flat are the steel pipe. 10 is attached to the end. The protrusion-provided ring 81 is formed with four protrusions 83 at 90 ° intervals in the circumferential direction on the surface to be joined. The concave grooved ring 82 has 90 ° intervals in the circumferential direction on the surface to be joined. Thus, grooves 84 are formed at four locations. The projection 83 of the ring with convex projection 81 is attached to the lower end of the steel pipe 10 arranged above so that the projection 83 protrudes downward, and the groove 84 of the ring 82 with concave groove is attached to the upper end of the steel pipe 10 arranged below. It is attached so as to be concave on the top. Here, the shape of the ring with convex projection 81 and the spherical ring with concave groove 82 is a shape that fits when they are overlapped and joined. In addition, the outer part of the ring 81 with a convex protrusion and the ring 82 with a groove is the protrusion part 11 which protrudes outside rather than the outer peripheral surface of the upper and lower steel pipes 10. FIG. Moreover, what is necessary is just to determine suitably a suitable thing by the material, cross-sectional area, etc. of the steel pipe 10 which comprises the joint structure 80 about the shape, the magnitude | size, etc. of the ring 81 with a convex protrusion, and the ring 82 with a groove. In the present embodiment, the shape of the protrusion 83 is a shape that forms a gradient that increases toward the center of the steel pipe 10, and the shape of the groove 84 is a shape that forms a gradient that deepens toward the center of the steel pipe 10.

In the joint structure 80 according to the seventh embodiment of the present invention configured by the components described above, a ring 81 with a convex protrusion that is attached in advance to the ends of the two steel pipes 10 to be connected. And a grooved ring 82. That is, the end portions of the upper and lower two steel pipes 10 (the lower end of the steel pipe 10 disposed above and the upper end of the steel pipe 10 disposed below) are butted so that the protrusion 83 and the groove 84 overlap each other. At this time, the ring with convex protrusion 81 and the ring with concave groove 82 are overlapped so that the protrusion 83 is fitted into the groove 84. Since the subsequent connection process between the steel pipes 10 is the same as that of the fourth embodiment, description thereof is omitted.

In the joint structure 80 connected as described above, even if a displacement of the upper and lower steel pipes 10 occurs in the joint part of the steel pipe 10 after connection, the steel pipe 10 is moved so as to slide along the direction of the protrusion 83 and the groove 84. This makes it easier for the upper and lower steel pipes 10 to be corrected to the correct positions. Further, since the steel pipes 10 are connected so that the protrusion 83 and the groove 84 overlap each other, the rotational force applied to one steel pipe 10 is efficiently transmitted to the other steel pipe 10. Therefore, as in the second embodiment, when driving a plurality of connected steel pipes 10 while rotating them on the ground, a pile or the like (connected steel pipes 10) can be driven efficiently.

(Eighth embodiment)
FIG. 18 is an explanatory view of a joint structure 90 according to the eighth embodiment of the present invention. FIG. 18A is a perspective view of the joint structure 90 as viewed obliquely from above. The joint structure 90 connects the ends of the two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below). FIG. 18A shows a state where the joint structure 90 is disassembled. 18B is a horizontal cross-sectional view of the joint structure 90 when the steel pipe 10 is connected, and FIG. 18C is an enlarged cross-sectional view of the joint structure 90 when the steel pipe 10 is connected. That is, FIG. 18B shows an EE cross section in FIG. 18C, and FIG. 18C shows an E′-E ′ cross section in FIG. In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, description of other members and the like is omitted.

In the eighth embodiment, a spherical disk 92 with a convex cross projection having an outer diameter larger than the outer diameter of the steel pipe 10 and having a cruciform projection 91 formed on the surface to be joined, and a cruciform shape. A spherical disk 94 with a concave cross groove having a spherical shape in which a cross groove 93 is formed is attached to the end of the steel pipe 10. Here, as shown in FIG. 18 (c), the cruciform protrusion 91 has a curved slope whose height increases as it approaches the center of the steel pipe 10, and the cross groove 93 approaches the center of the steel pipe 10. It has a curvilinear gradient such that the height decreases. A spherical disk 92 with a convex cross projection is attached to the lower end of the steel pipe 10 disposed above so as to protrude downward, and a spherical disk 94 with a concave cross groove is disposed at the upper end of the steel pipe 10 disposed below. It is attached so as to be concave on the top. Here, the spherical disc 92 with convex cross projections and the spherical disc 94 with concave cross grooves are shaped to fit when they are overlapped and joined. The outer portions of the spherical disk 92 with convex cross projections and the spherical disk 94 with concave cross grooves are projecting portions 11 that protrude outward from the outer peripheral surfaces of the upper and lower steel pipes 10. Further, the curvature of the spherical disk 92 with convex cross projections and the spherical disk 94 with concave cross grooves and the shape of the cross-shaped projections 91 and cross grooves 93 are suitable depending on the material and cross-sectional area of the steel pipe 10 constituting the joint structure 90. What is necessary is just to determine suitably. In the present embodiment, the shape of the cruciform protrusion 91 is a shape that forms a gradient that increases toward the center of the steel pipe 10, and the shape of the cross groove 93 is a shape that forms a gradient that deepens toward the center of the steel pipe 10. It is said.

In the joint structure 90 according to the eighth embodiment of the present invention configured by the components described above, the spherical surface with convex cross projections attached in advance to the ends of the two steel pipes 10 to be connected. The disc 92 and the concave cross grooved spherical disc 94 are abutted so that the cross-shaped projection 91 and the cross-shaped groove 93 overlap. That is, as shown to Fig.18 (a), the edge part (The lower end of the steel pipe 10 arrange | positioned above and the upper end of the steel pipe 10 arrange | positioned below) of the two upper and lower steel pipes 10 is faced | matched. At this time, the spherical disk 92 with a convex cross projection and the spherical disk 94 with a concave cross groove are overlapped so that the cross-shaped protrusion 91 is fitted in the cross groove 93. Since the subsequent connection process between the steel pipes 10 is the same as that of the fourth embodiment, description thereof is omitted.

In the joint structure 90 connected as described above, similarly to the fourth and fifth embodiments, even when the upper and lower steel pipes are bent at the joint portion of the steel pipe 10 after the connection, the upper steel pipe 10 can be moved so as to slide along the concave cross grooved spherical disk 94 and can be easily corrected so as to maintain linearity. Moreover, even when the installation deviation of the upper and lower steel pipes 10 occurs in the joint portion of the steel pipe 10 after the connection, the upper and lower steel pipes 10 are moved by sliding them along the direction of the cruciform protrusion 91 and the cross groove 93. It becomes easy to be corrected to the correct position. Furthermore, since the steel pipes 10 are connected so that the cruciform protrusion 91 and the cross groove 93 overlap each other, the rotational force applied to one steel pipe 10 is efficiently transmitted to the other steel pipe 10.

(Ninth embodiment)
FIG. 19 is an explanatory diagram of the joint structure 100 according to the ninth embodiment of the present invention. FIG. 19A is a perspective view of the joint structure 100 as viewed obliquely from above. The joint structure 100 connects the ends of the two cylindrical steel pipes 10 arranged in series vertically (the lower end of the steel pipe 10 arranged above and the upper end of the steel pipe 10 arranged below). FIG. 19A shows a state where the joint structure 100 is disassembled. FIG. 19B is a horizontal cross-sectional view of the joint structure 100 when the steel pipe 10 is connected, and FIG. 19C is an enlarged cross-sectional view of the joint structure 100 when the steel pipe 10 is connected. That is, FIG. 19B shows the FF section in FIG. 19C, and FIG. 19C shows the FF′-F ′ section in FIG. 19B. In the present embodiment, only the portion corresponding to the ring-shaped member 12 attached as a member having the protruding portion 11 to the end of the steel pipe 10 in the first embodiment is the first embodiment. Since there is a difference from the form, description of other members and the like is omitted.

In the ninth embodiment, a spherical surface with convex protrusions whose outer diameter is larger than the outer diameter of the steel pipe 10, whose inner diameter is smaller than the inner diameter of the steel pipe 10, and whose surface to be abutted when the steel pipe is connected (the joined body front surface) is a spherical shape. A ring 101 and a concave grooved spherical ring 102 are attached to the end of the steel pipe 10. Spherical protrusions 103 are formed at four locations at 90 ° intervals in the circumferential direction on the surface to be welded on the spherical ring 101 with convex protrusions, and the spherical ring 102 with concave grooves is formed in the circumferential direction on the surface to be welded. Spherical grooves 104 are formed at four positions at intervals of 90 °. A spherical ring 101 with convex protrusions is attached to the lower end of the steel pipe 10 disposed above so as to protrude downward, and a spherical ring 102 with a concave groove is recessed upward at the upper end of the steel pipe 10 disposed below. It is attached to become. Here, the shape of the spherical ring with convex protrusion 101 and the spherical ring with concave groove 102 is a shape that fits when they are overlapped and joined. Further, as shown in FIG. 19C, the spherical protrusion 103 has a curved gradient whose height increases as it approaches the center of the steel pipe 10, and the spherical groove 104 increases as it approaches the center of the steel pipe 10. It has a curvilinear gradient that reduces the height. The outer portions of the spherical ring with convex protrusion 101 and the spherical ring with concave groove 102 are protruding portions 11 that protrude outward from the outer peripheral surfaces of the upper and lower steel pipes 10. Moreover, what is necessary is just to determine suitably a suitable thing for the curvature of the spherical ring 101 with a convex protrusion, and the spherical ring 102 with a concave groove by the material, cross-sectional area, etc. of the steel pipe 10 which comprises the joint structure 100. FIG. Here, in the present embodiment, the spherical protrusion 103 has a spherical shape in which a gradient that increases toward the center of the steel pipe 10 is formed, and the spherical groove 104 has a gradient that increases in depth toward the center of the steel pipe 10. It has a spherical shape.

In the joint structure 100 according to the ninth embodiment of the present invention configured by the components described above, a spherical ring with convex protrusions attached in advance to the ends of the two steel pipes 10 to be connected 101 and spherical groove 102 with a groove are attached. That is, the end portions of the upper and lower steel pipes 10 (the lower end of the steel pipe 10 disposed above and the upper end of the steel pipe 10 disposed below) are butted so that the spherical protrusion 103 and the spherical groove 104 overlap. At this time, the spherical ring with convex protrusion 101 and the spherical ring with concave groove 102 are overlapped so that the spherical protrusion 103 is fitted into the spherical groove 104. Since the subsequent connection process between the steel pipes 10 is the same as that of the fourth embodiment, description thereof is omitted.

In the joint structure 100 connected as described above, similarly to the above-described embodiment, even when the upper and lower steel pipes are bent at the joint portion of the steel pipe 10 after the connection, the upper steel pipe 10 is formed into a concave grooved spherical surface. It can be easily rectified to move along the ring 102 and maintain linearity. Further, since the steel pipes 10 are connected so that the spherical protrusion 103 and the spherical groove 104 overlap, the rotational force applied to one steel pipe 10 is efficiently transmitted to the other steel pipe 10. Therefore, as in the second embodiment, when driving a plurality of connected steel pipes 10 while rotating them on the ground, a pile or the like (connected steel pipes 10) can be driven efficiently.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

For example, in the first to ninth embodiments, the shape of the connecting member 15 is an arc shape, and the shape of the fixing member 20 is a sheath-like cylindrical shape, but can be appropriately changed depending on the outer peripheral shape of the steel pipe 10 or the like. . Moreover, in the said 6th Embodiment-9th Embodiment, the shape of the protrusion provided in one protrusion part is made into the shape which has a gradient which becomes high toward the center of a steel pipe, and is provided in the other protrusion part. The shape of the groove is a shape having a slope that becomes deeper toward the center of the steel pipe, but the present invention is not limited to this, and for example, the shape of the protrusion provided on one of the protrusions is directed toward the center of the steel pipe. It is good also as a shape which has the shape which has a gradient which becomes low, and the shape of the groove | channel provided in the other protrusion part becomes a shape which becomes shallow toward the center of a steel pipe.
In the second embodiment, the concave portion 25 ′ is provided in one concave ring-shaped member 25 and the convex portion 26 ′ is provided in the convex ring-shaped plate 26. However, the concave portion 25 ′ and the convex portion are provided. The number of 26 'is not limited to one and may be plural. Also, the size and shape may be suitably set to a suitable size and shape.
In the third embodiment, four portions of the gap between the connecting members 15 ′ are the slits 42, and the four protrusions 41 are provided at the lower end of the fixing member 20 ′ accordingly. The number of 41 and slits 42 can be changed as appropriate.
Furthermore, although the first to ninth embodiments have been described above, it is naturally conceivable to use them in combination.

  The present invention can be applied to a steel pipe joint structure used for piles and the like.

DESCRIPTION OF SYMBOLS 1, 1 ', 1'', 50, 60, 70, 80, 90, 100 ... Joint structure 10 ... Steel pipe 11 ... Projection part 12 ... Ring-shaped member 15, 15' ... Connection member 16 ... Groove 20, 20 '... Fixing member 25 ... Concave ring-shaped member 25 '... Concave part 26 ... Convex ring-shaped member 26' ... Convex part 41 ... Protruding part 42 ... Slit 51 ... Convex spherical disk 52 ... Concave spherical disk 61 ... Convex spherical ring 62 ... Concave Spherical ring 71 ... Cross protrusion 72 ... Disc with convex cross protrusion 73 ... Cross groove 74 ... Disc cross grooved disk 81 ... Convex protrusion ring 82 ... Concave groove ring 83 ... Protrusion 84 ... Groove 91 ... Cross protrusion 92 ... Spherical disk with convex cross protrusions 93 ... Cross groove 94 ... Spherical disk with concave cross groove 101 ... Spherical ring with convex protrusion 102 ... Spherical ring with concave groove 103 ... Spherical protrusion 104 ... Spherical groove

Claims (8)

A joint structure connecting two steel pipes in series,
A pair of projecting portions provided on the ends of the two steel pipes and projecting outward from the outer peripheral surface of the steel pipe;
In a state in which the ends of the two steel pipes are butted together, a plurality of connecting members mounted from the outside of the pair of protrusions and formed with grooves for receiving the pair of protrusions on the inner peripheral surface;
A cylindrical fixing member mounted on the outside of the plurality of connecting members mounted on the pair of protrusions ;
The steel pipe joint structure according to claim 1, wherein an upper end of the fixing member is provided with an engaging portion capable of abutting against an upper surface of a connecting member attached to the protruding portion . The steel pipe joint structure according to claim 1, wherein the projecting portion is constituted by a disk-shaped member, a ring-shaped member, or an arc-shaped member attached to an end of the steel pipe. The steel pipe according to claim 1 or 2, wherein the plurality of connecting members have an arc shape, and an annular shape surrounding the outer peripheral surface of the steel pipe is formed by combining the connecting members. Joint structure. The convex part is provided in one opposing surface of the said pair of protrusion part, and the recessed part which can receive the said convex part is provided in the other opposing surface, The any one of Claims 1-3 characterized by the above-mentioned. A steel pipe joint structure according to any one of the above. The lower end of the fixing member is provided with a protrusion that is fastened to the lower surface of the connection member attached to the protrusion,
The said connection member is comprised so that the outer peripheral surface of the said steel pipe may be enclosed in the state which provided the slit which lets the said projection part pass when attaching the said fixing member, The any one of Claims 1-4 characterized by the above-mentioned. A steel pipe joint structure according to any one of the above. The steel pipe according to any one of claims 1 to 5, wherein opposing surfaces of the pair of projecting portions have shapes that match each other, one opposing surface has a concave spherical shape, and the other opposing surface has a convex spherical shape. Joint structure. A cross-shaped groove having a gradient deeper toward the center of the steel pipe is formed on the opposing surface of one of the protruding portions, and the opposing surface of the other protruding portion has a shape that fits the cross-shaped groove. The joint structure for a steel pipe according to any one of claims 1 to 6, wherein a cross-shaped convex part having a gradient that increases toward the center of the steel pipe is formed. A cross-shaped groove having a slope that becomes shallower toward the center of the steel pipe is formed on the opposing surface of one of the protruding portions, and the opposing surface of the other protruding portion is shaped to fit the cross-shaped groove. The joint structure for a steel pipe according to any one of claims 1 to 6, wherein a cross-shaped convex part having a slope that decreases toward the center of the steel pipe is formed.

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